My removable hard dive is transferring data 10-15 mb/sec

To have the maximum transfer speed for your external hard drive, since it supports USB 3.0, the USB port on your computer should also be USB 3.0. It is compatible with USB 2.0 but with a downgraded speed. The new USB 3.0 technology now features the new transfer mode SuperSpeed which is capable of transferring data up to 5 Gbit/s or around 625 MB/s.

This is more than ten times what USB 2.0 high speed can give which is 480 Mbit/s or around 60 MB/s. But don’t be fooled and expect a full speed when transferring data with your external hard drive even if the device is USB 3.0 compliant. This is not usually the case.

Most of the time, you will not get the SuperSpeed mode with your USB 3.0 device. According to manufacturers, most of the USB 3.0 devices max out at around 100MBps or probably less. It’s the same with USB 2.0, it also didn’t achieve the maximum speed and it’s very uncommon for a USB 2.0 flash drive to arrive at a read speed higher than 40MBps.

But even if this is the case, USB 3.0 is still almost 3 times faster than USB 2.0.

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